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Message: [QUOTE="sonic blue l, post: 1384836, member: 5185"] never saw a cracked 6.4 piston in person.(especially stock trucks) (mind you I am forget full) #1 failure is lifters. (stock) worn off rocker arms from lack of maintenance is second. (stock and tuned) Have had rods outside block due to hydrolock from failed egr cooler. (stock, dually) had piston pin wear out. (*******) front cover cavitation taking out bearings, resulting in so much crank end play that the ring gear chewed into the transmission case. (stock service truck) bent rod and hole burnt through piston. (h&s xrt pro) melted pistons, with all injector tips blown off. (sct livewire) only cracked piston ive had was on a 7.3. that had gone through multiple turbo's (factory with a banks waste gate, chiped (piggy back chip on pcm, on a 550 service truck that a 12,000 lb jack would not lift the ass end). so not exactly the pistons fault. 7.3 with failed lifters, 6.0l failed lifters, but 6.4 is the most prone to failed lifters. 7.3 with loose cam retainment plate bolts (took out cmp sensors) (econoline) 7.3 with cylinder porosity (econoline) 7.3 idi failed oil cooler resulting in coolant contamination of the oiling system 7.3 dusting, 7.3 piston pin worn out due to missing oil squirter 6.0l with slipped crank trigger wheel 6.7 with failed lifter, however the engine had a short block replaced previously by a hack dealership, so cant conclusively blame the lifter as there were so many things wrong with that engine assembly (bolts wrong places, etc. basic hack job) So funny thing is I have seen some weird ****, but not cracked pistons. ive seen reman engines come with cracked heads, half the cylinder wall with no cross hatch, etc. back ground ive worked on 7.3's while they were under warranty so ive been around for a couple years. With that said, a tuned truck needs a wider bowl, I like my ih pistons :) [/QUOTE]